testAction() 函数在 CakePhp 测试中的 debug() 上返回 null

I was trying to learn how to use unit testing in CakePhp, I'm trying to write a controller test. I read about testAction() and debug() function, but It doesn't work for me, I mean, the test method passes, but the debug() returns null (because testAction does)

This is my code:

<?php
App::uses('Controller', 'Controller');
App::uses('View', 'View');
App::uses('PostsController', 'Controller');

class PostsControllerTest extends ControllerTestCase {
    public function setUp() {
       parent::setUp();
       $Controller = new Controller();
       $View = new View($Controller);
       $this->Posts = new PostsController($View);
    }

    public function testIndex() {
          $result = $this->testAction('Posts/Index');
        debug($result);        

    }
}

Posts/index controller returns a list of all posts stored in the DB.

解决方案

I'm assuming you're using CakePHP 2.

$this->testAction() can return a few different results, depending on the options you give it.

For example, if you set the return option to vars, the testAction() method will return an array of the vars that have been set in the tested action:

public function testIndex() {
    $result = $this->testAction('/posts/index', array('return' => 'vars'));
    debug($result);
}

In this example, the debug data should be an array of the vars that you set in the /posts/index action.

The CakePHP documentation describes the possible results that you can have returned here: http://book.cakephp.org/2.0/en/development/testing.html#choosing-the-return-type

Note that the default option, result, gives you the value that your controller action returns. For most controller actions this will be null, so the fact that you're getting null in your example is to be expected.